Chenbro RM253 Series User manual

A document provides an overview of product features, functions, architecture, and support specifications.
RM253 Series
Rackmount Chassis User Manual

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fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of
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© 2023 Chenbro Micom Co., Ltd.

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Table of Contents
List of Figures..................................................................................................................................................................................5
List of Tables....................................................................................................................................................................................7
1. Product Overview................................................................................................................................................................. 8
1-1 System Features Overview ..................................................................................................................... 9
1-2 Front Panel ............................................................................................................................................. 10
1-3 Rear Panel .............................................................................................................................................. 10
1-4 Front Control Panel............................................................................................................................... 11
1-5 Storage Configurations ........................................................................................................................ 12
1-6 Chassis Dimensions............................................................................................................................... 13
1-7 Available Rack Mounting Kit Options (Refer to “Installation”)........................................................ 14
1-8 System Level Environmental Specifications....................................................................................... 15
1-9 System Packaging ................................................................................................................................. 16
2. System Components Removal and Installation ......................................................................................................17
2-1. Top Cover Removal and Installation................................................................................................... 18
2-2 Hot-swap HDD Assembly Removal and Installation ........................................................................ 21
2-3 Fan Assembly Removal and Installation............................................................................................. 23
2-5 Full Height PCI-e Card Installation...................................................................................................... 26
2-6 PSU Installation and Removal.............................................................................................................. 27
2-7 Slide Rail Installation............................................................................................................................. 28
2-8 System Maintenance............................................................................................................................. 29
2-9 HDD Cage Removal and Installation (For Storage Backplane Maintenance)................................ 30
3. Backplane ..............................................................................................................................................................................32
3-1 Storage Backplane Options ................................................................................................................. 33
3-2 3.5” 12-port 12Gb/s SAS Active Backplane........................................................................................ 34
3-3 2 x 2.5” Drive Bay Accessory Kit .......................................................................................................... 37
4. Fanboard................................................................................................................................................................................40
4-1 Interface Introduction........................................................................................................................... 40
4-2 Auto Fan Control Algorithm ................................................................................................................ 43
5. Cable Routing ......................................................................................................................................................................44

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5-1 FIO Cable Routing ................................................................................................................................. 45
5-2 USB 3.0 Cable Routing.......................................................................................................................... 46
5-3 Mini SAS HD Cable Routing................................................................................................................. 47
5-4 I2C Cable Routing ................................................................................................................................. 47
6. Maintenance and Service ................................................................................................................................................48

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List of Figures
Figure 1 RM253 Overview.......................................................................................................................................................... 9
Figure 3 RM253 Major Component Overview....................................................................................................................9
Figure 4 RM253 Front Panel....................................................................................................................................................10
Figure 5 Back Panel with PSU .................................................................................................................................................10
Figure 6 Back Panel Without PSU..........................................................................................................................................10
Figure 7 Front Control Panel...................................................................................................................................................11
Figure 8 12 x 3.5" Drive-bay Configuration (Right) ........................................................................................................12
Figure 9 12 x 3.5" Drive-bay Configuration (Left)............................................................................................................12
Figure 10 Chassis Dimensions ................................................................................................................................................13
Figure 11 Front Top Cover Removal ....................................................................................................................................18
Figure 12 Middle Top Cover Removal.................................................................................................................................18
Figure 13 Rear Top Cover Removal ......................................................................................................................................19
Figure 14 Front Top Cover Installation................................................................................................................................19
Figure 15 Rear Top Cover Installation .................................................................................................................................20
Figure 16 Middle Top Cover Installation ............................................................................................................................20
Figure 17 3.5" Hot-swap HDD Assembly Removal .........................................................................................................21
Figure 18 3.5" Hot-swap HDD Assembly Installation ....................................................................................................21
Figure 19 3.5" HDD Installation (Tool-less)........................................................................................................................22
Figure 20 HDD Removal (Tool-less) .....................................................................................................................................22
Figure 21 Fan Assembly Removal..........................................................................................................................................23
Figure 22 Fan Assembly Installation.....................................................................................................................................23
Figure 23 Fan Module Removal.............................................................................................................................................24
Figure 24 Fan Module Installation ........................................................................................................................................24
Figure 25 2.5” 2-Bay Drive Backplane Installation (Back Panel).................................................................................25
Figure 26 2.5" 2-Bay Drive Installation (Back Panel).......................................................................................................25
Figure 27 Full Height Back Panel Bracket Installation ...................................................................................................26
Figure 28 CRPS Module Installation.....................................................................................................................................27
Figure 29 CRPS Module Removal..........................................................................................................................................27

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Figure 30 Slide Rail Installation 1 (384-RAL000005SA0)...............................................................................................28
Figure 31 Slide Rail Installation 2 (384-RAL000005SA0)...............................................................................................28
Figure 32 Removal of Whole System from the Rack......................................................................................................29
Figure 33 Installation of Whole System into the Rack ..................................................................................................29
Figure 34 HDD Cage Removal (Right) .................................................................................................................................30
Figure 35 HDD Cage Removal (Left) ....................................................................................................................................30
Figure 36 HDD Cage Installation (Left)................................................................................................................................31
Figure 37 HDD Cage Installation (Right).............................................................................................................................31
Figure 38 Drive Tray LED Identifications.............................................................................................................................32
Figure 39 Backplane Front View ............................................................................................................................................34
Figure 40 Backplane Rear View..............................................................................................................................................35
Figure 41 2.5" 2-bay Drive Module.......................................................................................................................................37
Figure 42 Backplane Front View ............................................................................................................................................38
Figure 43 Backplane Rear View..............................................................................................................................................38
Figure 44 Fanboard.....................................................................................................................................................................40
Figure 45 FIO Cable Routing...................................................................................................................................................45
Figure 46 USB 3.0 Cable Routing...........................................................................................................................................46
Figure 47 Mini SAS HD Cable Routing ................................................................................................................................47
Figure 48 I2C Cable Routing ...................................................................................................................................................47

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List of Tables
Table 1 RM253 Specifications................................................................................................................................................... 8
Table 2 Front Control Panel.....................................................................................................................................................11
Table 3 Slide Rail Option ..........................................................................................................................................................14
Table 4 System Environmental Specifications Summary..............................................................................................15
Table 5 Drive Power LED/Activity LED Behavior ..............................................................................................................32
Table 6 Backplane Specifications...........................................................................................................................................34
Table 7 Connector and Pin Header Function Description............................................................................................35
Table 8 DIP Switch Settings.....................................................................................................................................................36
Table 9 I2C Mode for RM253 Series.....................................................................................................................................36
Table 10 Fan Settings for RM25324 .....................................................................................................................................36
Table 11 Backplane Specifications ........................................................................................................................................37
Table 12 Connector and Pin Header Function Description.........................................................................................39
Table 13 Backplane Specifications ........................................................................................................................................40
Table 14 Connector and Pin Header Function Description.........................................................................................41
Table 15 Connector and Pin Header Function Description.........................................................................................42

1. Product Overview
This RM253 Series offers a high-density enterprise solution for data centers with greater storage and user-friendly
maintenance. This 2U chassis supports up to 24-bay 3.5” storage form factors. Tool-less designs such as color-coded touch
points and the falcon wing make the top cover removal no longer necessary, providing easy access and maintenance in data
centers. The current model is RM25324 which supports up to ATX motherboard. This chapter provides a high-level overview of
the system features of this product series. More details for each major component, feature, or option are provided in the
following chapters.
Table 1 RM253 Specifications
Feature
Description
Supported M/B Form Factor
ATX (12’’ x 9.6’’)
Dimension
(D x W x H)
880mm x 438mm x 87mm
34.65’’ x 17.24’’ x 3.43’’
Drive Bay
24 x 3.5” SAS/SATA HDD Hot-swap Module
2 x 2.5” SAS/SATA HDD Hot-swap Module, Rear (Option)
Storage Backplane
2 x 3.5” 12-port 12Gbps SAS Expander
1 x 2.5” 2-port 12Gbps SAS/SATA or NVMe Gen 3 (Option)
PSU Form Factor
2U Redundant CRPS 1+1, 800W (80+, Platinum)
Indicators
1 x Power Status, 1 x UID, ,2 x LAN Activity, 1 x HDD Status, 2 x HDD Failure, 1
x System Alarm
Front Control
1 x Power On/Off, 1 x System Reset, 1 x UID, 2 x USB 3.0
Cooling Fans
Middle: 6 x 60 mm, PWM, 23000 RPM, hot-swap
Expansion Slot Opening
7 x Low Profile or 3 x Full Height (optional)
Supported Rack Mount Kit (Options)
•
Slide Rail Kit with CMA Support: Works for 438 mm Width Rack Chassis,
P2P: 26” to 35”, Traveling Distance 28.1”, Maximum Load Weight: 59 KG,
Tool-less
•
Cable Management Arm (CMA): 84H349010-006
Net Weight
21 kg/PC
Gross Weight
26 kg/CTN
Cubic Feet
5.6 (1120 x 590 x 240 mm)
Pallet Size
1180 x 1110 x 120 mm
Cartons Per Pallet
8 PCS/Pallet
Container Loading
(Single Packing)
20’ FCL: 128 PCS / 40’ FCL: 320 PCS

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1-1 System Features Overview
Figure 1 RM253 Overview
Figure 2 RM253 Major Component Overview
A. Front Top Cover
B. Middle Top Cover
C. Rear Top Cover
D. Fan Assembly
E. Server board
F. 2.5” HDD Hot-Swap Cage
G. Power Supply Unit
H. 3.5” Hot-swap Cage (Left)
I. 3.5” Hot-swap Cage (Right)

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1-2 Front Panel
Figure 3 RM253 Front Panel
A. Front Control Panel
B. Info Tag
C. Rack Handles
1-3 Rear Panel
Figure 4 Back Panel with PSU
Figure 5 Back Panel Without PSU
A. CRPS Power Supply
B. I/O Gasket
C. Low Profile Expansion Slots
D. 2 x 2.5” Hot-swap Drives

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1-4 Front Control Panel
Figure 6 Front Control Panel
Table 2 Front Control Panel
Label
ICON
Indicator, Button, or Connector
A Power Button
B UID Button
C Reset Button
D USB 3.0
E HDD Activity LED
F System Alarm LED
G LAN1, LAN2 Activity LED
H L Left HDD Failure LED
I R Right HDD Failure LED

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1-5 Storage Configurations
Figure 7 12 x 3.5" Drive-bay Configuration (Right)
Figure 8 12 x 3.5" Drive-bay Configuration (Left)

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1-6 Chassis Dimensions
Figure 9 Chassis Dimensions

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1-7 Available Rack Mounting Kit Options (Refer to “Installation”)
Advisory Note – Available rack and cabinet mounting kits are not designed to support shipment of the server system
while installed in a rack. If you choose to do so, Chenbro advises you to verify your shipping configuration with
appropriate shock and vibration testing before shipment. Chenbro does not perform shipping tests which cover the
complex combination of unique rack offerings and custom packaging options.
Caution: Exceeding the specified maximum weight limit of a given rail kit or misalignment of the server in the rack may
result in failure of the rack rails, causing damage to the system or personal injury. Two persons to operate or the use of
a mechanical assist tool to install and align the server into the rack is highly recommended.
Available rack mounting kits:
Table 3 Slide Rail Option
Part Number 384-RAL000005SA0
Rail Dimensions (mm/inch)
878/34.56
Applicable Cabinet-Post to Post (mm/inch)
599 to 892.4/23.58 to 35.13
3 Section/2 Section
3 Section
Post to Post Distance (mm/inch)
599 to 892.4/23.58 to 35.13
Traveling Distance (mm/inch)
715/28.15
Support Chassis Width (mm)
438
Loading (kg)
35 kg
Tool-less
Yes
Support CMA
Yes

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1-8 System Level Environmental Specifications
The following table defines the system level specifications under operating and non-operating environments.
Table 4 System Environmental Specifications Summary
Parameter Specifications
Temperature
Operating
5º C to 35º C (41º F to 95º F)
Relative Humidity: 10% to 80% (non-condensing)
Temperature
Non-Operating
-40º C to 70º C (-40º F to 158º F)
Humidity
Non-Operating
25° C to 35° C (77º F to 95º F)
50% to 90% (non-condensing)
Unpackaged Shock
Non-Operating
Trapezoidal 25G (all six sides tested)
Unpackaged
Vibration
Operating
0.26 Grms at 5 Hz to 350 Hz (all three axes).
Sag & bow
Non-Operating
Tolerance analysis among rack rail and chassis
Actual on rack test with EIA Go-NoGo fixture
EMI
Pre-scan
Radiated Emissions
FCC Part 15 / EN 55032 / CISPR 32, Class A
30MHz ~18GHz
ESD
Contact and Air Discharge
IEC 61000-4-2
Packaged Vibration
Non-Operating
ISTA 1A (weight equal or less than 68kg)
Packaged Drop
Non-Operating
Refer to Intel blue book
Drop height change is based on product weight.
Gross weight 36.28 to 45.34 Kg : 45.72 cm (18 inches).
Validation: Test requirement is 6 face drops, 2 corner drops and 3 edge
drops for a total of 11 drops.
Acceptable Conditions:
Carton corner or edge sunken but does not break.
Carton broken in inside surface, but not too big and it does not pierce
through surface.
The basic functioning is normal.

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1-9 System Packaging
The original Chenbro packaging, where the server system is delivered, is designed to provide protection for L5 configuration and
tested to meet ISTA (International Safe Transit Association) Test Procedure 1A (2008). The packaging is also designed to be
reused for shipment after the system integration has been completed.
The original packaging includes the shipping box, and various protective inner packaging components, which are designed to
function together as a protective packaging system. When reused, all of the original packaging material must be used, including
box and each inner packaging component. In addition, all inner packaging components MUST be reinstalled in the proper
location to ensure adequate protection to the system for subsequent shipment.
λNOTE: The design of the inner packaging components does not prevent improper placement within the packaging
assembly. There is only one correct packaging assembly that will allow the package to meet the ISTA (International Safe
Transit Association) Test Procedure 1A (2008).
Failure to follow the specified packaging assembly instructions may result in damage to the system during shipment.
λNOTE: A L5 system does not include M/B, processors, memory, drives, or add-in cards. It is the system
configuration as shipped from Chenbro. Weights of integrated system (system configurations that include the items above)
will vary depending on the final system configuration.

2. System Components Removal and
Installation
RM253 series supports the following storage options:
•Up to 24 x 3.5” hot-swap HDD
•2 x 2.5’’ hot-swap SAS/SATA HDD/SDD (optional)

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2-1. Top Cover Removal and Installation
Figure 10 Front Top Cover Removal
1. Loosen two thumb screws on each side of the cover.
2. Loosen all 18 screws on the surface of the top cover.
3. Lift up the cover as shown and remove it vertically.
Figure 11 Middle Top Cover Removal
1. Loosen two thumb screws on the middle top cover.
2. Slide it forward and remove it vertically with both hands to hold each side.

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Figure 12 Rear Top Cover Removal
1. Loosen two screws on each side of the rear top cover.
2. Slide the cover backward and remove it vertically.
Figure 13 Front Top Cover Installation
1. Align the guide pins of the rear top cover with the grooves on the chassis base.
2. Secure with all 18 screws on the surface of the top cover.
3. Secure with the thumb screws on both sides of the cover.

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Figure 14 Rear Top Cover Installation
1. Align the guide pins of the rear top cover with the grooves on the chassis base.
2. Install the cover vertically as shown and slide it forward.
3. Secure with two screws as shown.
Figure 15 Middle Top Cover Installation
1. Install the cover vertically and slide it toward the rear top cover until it locks.
λNOTE: Install the rear top cover before installing the middle top cover.
2. Secure with two thumb screws.